blocking files of certain file extension

could anyone tell me how files with extensions like .zip, .avi, etc be blocked by nod32 ? Also is ther provision of blocking mail attachment based on file extension? there is scanning provision for scanning archives but i could not block mail attachments.

What action is taken against infected files in nod32 ver 2.52. And where are the infected files stored?

Thankyou for answering my queries.
I am using the Nod32 for Linux mail servers. we had used Nod32 with inflex which binded sendmail with it but now we are trying to just use Nod32. Can u tell me if Nod32 also automatically binds sendmail or we have to run sendmail separately while using Bi-directional scanning(content filtering in MTA).